I will try my best to fill up the request list for 3D icons, you might not know normally I spent 2 to 3 hours just to make an icon full set.
I don't have most of the games/apps in my 3GS iphone, is 3GS not 4/4S ... I need to find the original arts and do some online research before starting to create an icon.
So please be patient with me, I believed your icons has already auto skin under boss icon framework

Put/SSH the folder in your theme's directory and*select in Winterboard.

To get rid of the ribbon, you have to comment out or remove the source code for the ribbon in the LockBackground.html file. I believe the ribbon file name is overlayR.png.

As for the SB screen image, you will need to erase the left frame making it transparent, and adding code similar to the LS to display the left side image in the Wallpaper.html file. Also, dont forget to comment out the ribbon if you are displaying a left side image. Easiest way is to photoshop an image on the SB left frame... but I like changing my images often.